Mac Studio M3 Ultra 512GB Price & Used Prices: Which Local LLMs Can It Run?
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The Mac Studio M3 Ultra 512GB (Apple, 2025) runs DeepSeek V4 Flash at 4-bit at about 62 tokens/s. This configuration is discontinued; buy used.
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Mac Studio M3 Ultra 512GB price history
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Full Mac Studio M3 Ultra 512GB specifications
- Memory512 GB · LPDDR5-6400 · unified memory
- Bandwidth819 GB/s
- Chip
- Apple M3 Ultra
- CPU
- 32-core
- GPU
- 80-core
- Storage
- 1 TB / 2 TB / 4 TB / 8 TB / 16 TB
- Ecosystem
- Metal
- Power
- 480 W
- Weight
- 3.64 kg
- Model identifier
- Mac15,14
- Type
- Unified memory
- Launch date
- Mar 12, 2025
Best Mac Studio M3 Ultra 512GB deals on eBay
Hand-picked deals from trusted eBay sellers. Shop with confidence.
As an eBay Partner, VRAMGlass may be compensated if you buy through the eBay links on this page. The price you pay stays the same.
NewApple Mac Studio M3 Ultra 512GB 80-Core GPU 2TB SSD Never Used - Miami$22,900+ shippingBuy on eBay
UsedApple Mac Studio M3 Ultra 80-Core GPU 512GB RAM 2TB SSD 10GbE 2025 • Very GoodTop Rated$22,999Buy on eBay
NewApple Mac Studio M3 Ultra 32C/80C 512GB 2TB Apple Certified 1 Year WarrantyTop Rated$25,000Buy on eBay
NewApple Mac Studio M3 Ultra 32C/80C 512GB 8TB Apple Certified 1 Year WarrantyTop Rated$30,000Buy on eBay
UsedApple Mac Studio 2025 M3 Ultra 512GB RAM 16TB SSD 80-Core GPU - UsedTop Rated$30,000Buy on eBay
What LLMs can a single Mac Studio M3 Ultra 512GB run?
A single M3 Ultra 512GB fits even 300B-class MoE at 8-bit. Daily, 4-bit runs Qwen3.8 Flash Next in the 90s; DeepSeek V4 Flash barely slows at 8-bit.
| Model | Size | Runs? | Speed t/s | Max context |
|---|---|---|---|---|
 Gemma 4 E4B8B | 3.8 GB | Runs | 132 | 128K |
 Qwen3.5 9B9.7B | 4.1 GB | Runs | 122.8 | 256K |
| Gemma 4 12B12B | 4.7 GB | Runs | 108.1 | 256K |
| Gemma 4 26B A4B25.2B (3.8B active) | 10.5 GB | Runs | 133 | 256K |
| Qwen3.6 27B27.8B | 11.8 GB | Runs | 48.5 | 256K |
| Qwen3.8 27B27.8B | 9.8 GB | Runs | 57.4 | 256K |
 GLM 4.7 Flash30B (3B active) | 11.9 GB | Runs | 144.1 | 198K |
| Gemma 4 31B30.7B | 11.8 GB | Runs | 46.8 | 256K |
| Qwen3.6 35B A3B36B (3B active) | 12.3 GB | Runs | 154.7 | 256K |
| Qwen3.8 Flash Next176B (6B active) | 78.9 GB | Runs | 109.4 | 256K |
 DeepSeek V4 Flash284B (13B active) | 96.8 GB | Runs | 84.8 | 1M |
 Hy3295B (21B active) | 107.2 GB | Runs | 52.8 | 256K |
| GLM 5.3 Flash320B (18B active) | 108.7 GB | Runs | 68.9 | 1M |
| Model | Size | Runs? | Speed t/s | Max context |
|---|---|---|---|---|
| Gemma 4 E4B8B | 5 GB | Runs | 105.4 | 128K |
| Qwen3.5 9B9.7B | 5.7 GB | Runs | 93.6 | 256K |
| Gemma 4 12B12B | 7.1 GB | Runs | 76.5 | 256K |
| Gemma 4 26B A4B25.2B (3.8B active) | 16.9 GB | Runs | 110.5 | 256K |
| Qwen3.6 27B27.8B | 16.8 GB | Runs | 35 | 256K |
| Qwen3.8 27B27.8B | 16.5 GB | Runs | 35.6 | 256K |
| GLM 4.7 Flash30B (3B active) | 18.3 GB | Runs | 125.6 | 198K |
| Gemma 4 31B30.7B | 18.3 GB | Runs | 31.5 | 256K |
| Qwen3.6 35B A3B36B (3B active) | 22.1 GB | Runs | 128.7 | 256K |
| Qwen3.8 Flash Next176B (6B active) | 111.3 GB | Runs | 91.7 | 256K |
| DeepSeek V4 Flash284B (13B active) | 155.1 GB | Runs | 62.3 | 1M |
| Hy3295B (21B active) | 182.2 GB | Runs | 36.4 | 256K |
| GLM 5.3 Flash320B (18B active) | 199.7 GB | Runs | 44.1 | 1M |
| Model | Size | Runs? | Speed t/s | Max context |
|---|---|---|---|---|
| Gemma 4 E4B8B | 8.2 GB | Runs | 68.6 | 128K |
| Qwen3.5 9B9.7B | 9.5 GB | Runs | 59.7 | 256K |
| Gemma 4 12B12B | 12.7 GB | Runs | 45.5 | 256K |
| Gemma 4 26B A4B25.2B (3.8B active) | 26.9 GB | Runs | 87.3 | 256K |
| Qwen3.6 27B27.8B | 28.6 GB | Runs | 21.1 | 256K |
| Qwen3.8 27B27.8B | 29 GB | Runs | 20.8 | 256K |
| GLM 4.7 Flash30B (3B active) | 31.8 GB | Runs | 98.9 | 198K |
| Gemma 4 31B30.7B | 32.6 GB | Runs | 18.3 | 256K |
| Qwen3.6 35B A3B36B (3B active) | 36.9 GB | Runs | 102.7 | 256K |
| Qwen3.8 Flash Next176B (6B active) | 188.2 GB | Runs | 66.3 | 256K |
| DeepSeek V4 Flash284B (13B active) | 161.9 GB | Runs | 60.5 | 1M |
| Hy3295B (21B active) | 317.7 GB | Runs | 23.4 | 256K |
| GLM 5.3 Flash320B (18B active) | 341 GB | Runs | 28.3 | 1M |
RunsFits fully in VRAM; speed is estimated from VRAM bandwidth.
Too bigWon’t fit on one card at this quantization, even with RAM offload.
Full calculation rules are on the Methodology page.
Who it suits
Good fit
- Running DeepSeek V4 Flash at 4-bit on one machine
All 155.1 GB fits, at about 62 tokens/s, with up to 1M of context
- You want big MoE models at 8-bit
Even GLM 5.3 Flash at 8-bit (341 GB) fits, at about 28 tokens/s
- You don't want to build a multi-GPU server
On the same DeepSeek V4 Flash at 4-bit, a 96GB RTX PRO 6000 has to offload experts to system RAM and manages only about 13 tokens/s
- You want speed on 100B-class MoE models like Qwen3.8 Flash Next
About 92 tokens/s at 4-bit
Not a good fit
- You mainly run 30B-class or smaller models
Gemma 4 31B at 4-bit runs at about 32 tokens/s, a 128GB machine is enough, and 512GB goes unused
- You often feed it whole books or entire codebases
Prompt processing is its weak spot, at only about a tenth of an RTX 5090's speed in community tests
- You want to run large dense models
Dense models read all of their weights for every token, so they're slow even when they fit; Gemma 4 31B at 8-bit manages only about 18 tokens/s
Before you buy
You can no longer buy it new
In early March 2026, Apple dropped 512GB from the M3 Ultra Mac Studio's configuration options. The new Mac Studio announced in August switched to the M5 Ultra, whose 512GB version won't ship until late October. So M3 Ultra 512GB machines today come almost entirely from the used market and retail stock.
Check that it's really 512GB
512GB was only available with the top M3 Ultra (32-core CPU, 80-core GPU); the 60-core GPU version maxes out at 256GB, and memory can't be added after purchase. When inspecting a machine, check the memory and GPU core count in System Information. If it's listed as 512GB but has a 60-core GPU, the configuration is definitely wrong.
Clear Activation Lock on a used machine
If Activation Lock is on, an Apple silicon Mac still needs the original owner's Apple Account to activate, even after being erased and reinstalled. Before the deal, have the seller turn off Find My Mac in Find My and sign out of their Apple Account, then power it on in front of you to confirm.
Be prepared for slow prompt processing
Generation speed depends on memory bandwidth, and 819 GB/s is plenty. Prompt processing depends on compute, which is exactly where the M3 Ultra falls short: its GPU lacks the neural accelerators of the M5 generation. When you feed in lots of material with a 1M context, you'll wait a long time for the first token. In community tests, its prompt processing is only about a tenth of an RTX 5090's (that data used 2023's llama.cpp; newer versions are about 20% faster, but the gap is still several-fold). Apple says the new M5 Ultra processes prompts up to 4 times as fast as the M3 Ultra.
Multiple units can form a cluster
Starting with macOS 26.2, RDMA over Thunderbolt 5 is supported: up to four Mac Studios can be connected directly to each other, pooling memory with exo or MLX to run bigger models. RDMA is off by default and has to be enabled in Recovery mode; the M3 Ultra has six Thunderbolt 5 ports, enough for the cabling.
Compared with similar machines
Mac Studio M3 Ultra 512GB vs Mac Studio M5 Max 128GB, RTX PRO 6000, and DGX Spark 128GB: price, memory, bandwidth, compute and local LLM speed compared.
| Spec | Mac Studio M3 Ultra 512GB | Mac Studio M5 Max 128GB |  RTX PRO 6000 | DGX Spark 128GB |
|---|---|---|---|---|
| Memory | 512 GB | 128 GB75% less | 96 GB81% less | 128 GB75% less |
| Bandwidth | 819 GB/s | 614 GB/s25% lower | 1,792 GB/s119% higher | 273 GB/s67% lower |
| BF16 / FP16 compute | — | — | 500 TFLOPS | 125 TFLOPS |
| INT8 compute | — | — | 1,000 TOPS | 250 TOPS |
| Qwen3.8 27B speed (2-bit) | 57.4 t/s | 43.9 t/s24% slower | 114.6 t/s100% faster | 20.2 t/s65% slower |
| Largest dense model (4-bit) | 911B | 222B76% less | 165B82% less | 222B76% less |
| Power | 480 W | 480 WSame | 600 W25% higher | 240 W50% lower |
| Interface | — | — | PCIe 5.0 x16 | — |
| Released | 2025-03 | 2026-08 | 2025-03 | 2025-10 |
| eBay median |
As an eBay Partner, VRAMGlass may be compensated if you buy through the eBay links on this page. The price you pay stays the same.
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